Standardized Precipitation Index Table

Upper Platte Climate Division

Wyoming, Climate Division 10

Precipitation Data Table

Time Scale in Months (As of the end of Apr. 2026)
1 2 3 4 5 6 7 8 9 10 11 12 15 18 24 30 36 48 60 72
Accumulated Precipitation (in.) 1.43 2.28 2.74 3.13 3.96 4.36 5.69 7.21 8.04 8.64 9.29 10.87 14.33 16.51 21.82 27.63 35.78 49.75 62.06 70.88
Accumulated Precipitation Departure from Normal (in.) -0.14 -0.36 -0.75 -1.15 -1.16 -1.57 -1.33 -0.87 -0.96 -1.41 -1.98 -2.17 -2.21 -2.47 -4.28 -4.42 -3.41 -2.54 -3.31 -7.52
Accumulated Precipitation Percent of Average 91 86 79 73 77 74 81 89 89 86 82 83 87 87 84 86 91 95 95 90
Accumulated Precipitation Percentile (non-exceedance) 48.2 36.3 21.8 12.8 14.8 9.1 17.8 29.6 27.4 21 16.3 15.5 18.6 17.3 8.6 9.9 20.1 29.6 26.1 8.3
Standardized Precipitation Index -0.04 -0.35 -0.78 -1.14 -1.04 -1.34 -0.92 -0.54 -0.6 -0.81 -0.98 -1.01 -0.89 -0.94 -1.37 -1.29 -0.84 -0.54 -0.64 -1.39